On Wed, May 26, 2021 at 07:21:15AM +0000, Rantala, Tommi T. (Nokia - FI/Espoo) wrote:

2021-05-25 15:06 +0200, gregkh@linuxfoundation.org:

...

On Tue, May 25, 2021 at 12:41:15PM +0000, Rantala, Tommi T. (Nokia - FI/Espoo) wrote:

...

Can you please cherry-pick this to LTS:

commit bf53fc6b5f415cddc7118091cb8fd6a211b2320d Author: Jan Kratochvil jan.kratochvil@redhat.com Date:   Fri Dec 4 09:17:02 2020 -0300

perf unwind: Fix separate debug info files when using elfutils' libdw's unwinder

What exact kernel(s) do you want it backported to?

5.4.y please, tested Jan's and Dave's patches with it, and they cure some broken backtraces.

commit 4e1481445407b86a483616c4542ffdc810efb680 Author: Dave Rigby d.rigby@me.com Date: Thu Feb 18 16:56:54 2021 +0000

perf unwind: Set userdata for all __report_module() paths

What does this commit here have to do with the above?

confused as to what exactly you are asking for here, sorry, can you be more specific? Like "please apply commits X, Y, and Z, in that order, to the X.y kernel?"

thanks,

greg k-h

On Thu, May 27, 2021 at 10:04:51AM +0000, Rantala, Tommi T. (Nokia - FI/Espoo) wrote:

Hi Greg,

Please apply these two commits to 5.4.y (other LTSes are probably fine too, but I didn't test):

commit bf53fc6b5f415cddc7118091cb8fd6a211b2320d Author: Jan Kratochvil jan.kratochvil@redhat.com Date: Fri Dec 4 09:17:02 2020 -0300

perf unwind: Fix separate debug info files when using elfutils'

libdw's unwinder

commit 4e1481445407b86a483616c4542ffdc810efb680 Author: Dave Rigby d.rigby@me.com Date: Thu Feb 18 16:56:54 2021 +0000

perf unwind: Set userdata for all __report_module() paths

[...]

Fixes: bf53fc6b5f41 ("perf unwind: Fix separate debug info files

when using elfutils' libdw's unwinder")

These commits fix some broken backtraces when using the perf tool.

Also queued up for the 5.10.y tree as you do not want to move to a newer kernel and have a regression.

thanks,

greg k-h